content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------
   * VectorDataItem.java
   * -------------------
   * (C) Copyright 2007-2009, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 30-Jan-2007 : Version 1 (DG);
   * 24-May-2007 : Added getVector(), renamed getDeltaX() --> getVectorX(),
   *               and likewise for getDeltaY() (DG);
   * 25-May-2007 : Moved from experimental to the main source tree (DG);
   *
   */
  
  package org.jfree.data.xy;
  
  import org.jfree.data.ComparableObjectItem;
  
  /**
   * A data item representing data in the form (x, y, deltaX, deltaY), intended
   * for use by the {@link VectorSeries} class.
   *
   * @since 1.0.6
   */
  public class VectorDataItem extends ComparableObjectItem {
  
      /**
       * Creates a new instance of <code>VectorDataItem</code>.
       *
       * @param x  the x-value.
       * @param y  the y-value.
       * @param deltaX  the vector x.
       * @param deltaY  the vector y.
       */
      public VectorDataItem(double x, double y, double deltaX, double deltaY) {
          super(new XYCoordinate(x, y), new Vector(deltaX, deltaY));
      }
  
      /**
       * Returns the x-value.
       *
       * @return The x-value (never <code>null</code>).
       */
      public double getXValue() {
          XYCoordinate xy = (XYCoordinate) getComparable();
          return xy.getX();
      }
  
      /**
       * Returns the y-value.
       *
       * @return The y-value.
       */
      public double getYValue() {
          XYCoordinate xy = (XYCoordinate) getComparable();
          return xy.getY();
      }
  
      /**
       * Returns the vector.
       *
       * @return The vector (possibly <code>null</code>).
       */
      public Vector getVector() {
          return (Vector) getObject();
      }
  
      /**
       * Returns the x-component for the vector.
       *
       * @return The x-component.
       */
      public double getVectorX() {
          Vector vi = (Vector) getObject();
          if (vi != null) {
              return vi.getX();
          }
          else {
              return Double.NaN;
          }
      }
  
      /**
       * Returns the y-component for the vector.
       *
       * @return The y-component.
       */
      public double getVectorY() {
          Vector vi = (Vector) getObject();
          if (vi != null) {
              return vi.getY();
          }
          else {
              return Double.NaN;
          }
      }
  
  }
  